Even when sending physical letters, facilities enforce strict prison mail rules. Regulations vary by state and institution, but some standards are universal. Letters cannot contain violent, sexually explicit, gang-related, or hateful content. Inmates are prohibited from receiving contraband such as drugs, alcohol, or other restricted items. Some prisons require prior approval for certain correspondents, limiting who an inmate can write to.

All incoming and outgoing mail is inspected for security purposes. Staff may open, scan, or monitor letters before delivery. To avoid delays or rejections, include the inmate’s full name, identification number, and correct facility address, and place your return address inside the envelope. Respectful language and tone are critical, as threatening or inflammatory messages may be rejected. Legal correspondence, such as letters to attorneys or courts, is generally protected but still follows strict protocols.